Hydrolysed ≠ Dairy-Free: What You Need to Know About Hydrolysed Protein and Dairy Intolerance

In the world of protein supplements, the word “hydrolysed” gets thrown around a lot. But what does it actually mean—and more importantly, is it dairy-free? For people with lactose intolerance, dairy sensitivity, or milk protein allergies, this is a crucial question. Let’s break down what hydrolysed protein is, how it’s made, and when it is or isn’t suitable for people following a dairy-free diet.

What Does Hydrolysed Mean?

“Hydrolysed” refers to a process called hydrolysis, where protein molecules are broken down into smaller peptide chains or amino acids using enzymes or acids. This makes the protein easier and faster to digest, which can be helpful for individuals with sensitive stomachs or those wanting quicker absorption after workouts.

Hydrolysed proteins are often marketed as:

• Fast-absorbing

• Easy on digestion

• Low in allergens

They are commonly found in the form of:

• Hydrolysed whey protein

• Hydrolysed casein protein

• Hydrolysed collagen (usually from bovine or marine sources)

The key takeaway: hydrolysed refers to the processing method, not the protein source. And that distinction is crucial when it comes to dairy.

Hydrolysed Protein and Dairy: Not Always Dairy-Free

Just because a protein is hydrolysed doesn’t automatically mean it’s free from dairy. Many hydrolysed proteins are still derived from milk.

Common Hydrolysed Proteins That Contain Dairy:

• Hydrolysed Whey Protein Isolate (HWPI): Derived from whey, which is a milk protein

• Hydrolysed Casein Protein: Derived from casein, another milk protein

Even though hydrolysis breaks down the proteins into smaller components, the original source is still dairy. This means people with a milk allergy should avoid these products, even if they are hydrolysed.

That said, some hydrolysed whey protein isolates are processed in a way that removes most or all of the lactose, making them lactose-free. But being lactose-free and dairy-free are not the same thing:

• Lactose-free: Safe for people with lactose intolerance

• Dairy-free: Safe for people with milk allergies or who avoid all dairy

People with a milk protein allergy (such as to casein or whey) still need to avoid hydrolysed whey or casein proteins, even if they’re lactose-free.

When Is Hydrolysed Protein Dairy-Free?

Some hydrolysed proteins are completely free of dairy—because they’re not made from milk to begin with. Here are a few examples:

Hydrolysed Proteins That Can Be Dairy-Free:

• Hydrolysed Collagen: Usually sourced from bovine (cow) or marine (fish), not dairy

• Hydrolysed Rice Protein: Plant-based and completely dairy-free

• Hydrolysed Pea Protein: Another dairy-free, plant-based option

These types of hydrolysed proteins are suitable for people with dairy allergies or those following a dairy-free or vegan diet (collagen being the exception, as it’s animal-derived).

If you’re unsure whether a protein powder is dairy-free, look at the ingredient list and allergen statements. Many brands will specify “dairy-free” or “contains milk” clearly on the label, especially in Australia where allergen labelling is regulated.

Benefits of Hydrolysed Protein (Dairy-Free or Not)

Whether it’s made from dairy or not, hydrolysed protein offers some potential benefits:

• Faster absorption: Ideal for post-workout recovery

• Improved digestibility: Smaller peptides may be easier on the gut

• Lower allergenic potential: Hydrolysis may reduce the allergenicity of some proteins, although this doesn’t make dairy-safe for all

People with sensitive digestion or those recovering from illness sometimes find hydrolysed proteins easier to tolerate than whole protein forms.

Common Questions About Hydrolysed and Dairy-Free

Is hydrolysed whey lactose-free?

It can be. Some hydrolysed whey proteins go through additional filtration to remove lactose. However, they are still not dairy-free.

Can people with lactose intolerance use hydrolysed protein?

Possibly. If it’s hydrolysed whey protein isolate that’s been labelled lactose-free, many people with lactose intolerance can tolerate it. However, always check the label.

Is hydrolysed protein vegan?

Not always. Hydrolysed collagen, for example, is not vegan as it comes from animal tissues. Hydrolysed pea or rice proteins are vegan and dairy-free.

Can hydrolysed protein cause an allergic reaction?

If you’re allergic to milk proteins, yes—if the protein is hydrolysed whey or casein. If it’s from a dairy-free source like pea or rice, the risk is different.

The Australian Context

In Australia, where food labelling laws are strict, protein powders must clearly state whether they contain allergens like milk. If a hydrolysed protein product is made from dairy, it will be labelled accordingly.

There is also growing availability of dairy-free and plant-based hydrolysed proteins, making it easier for Australians with dairy intolerance or preferences for plant-based diets to find suitable options.

Brands selling in Australia often differentiate between “lactose-free” and “dairy-free,” which is important for consumers with different sensitivities.

Summary: Hydrolysed ≠ Dairy-Free

To wrap things up:

• “Hydrolysed” refers to how a protein is processed, not its source

• Hydrolysed whey or casein still come from milk—so they are not dairy-free

• Hydrolysed whey can be lactose-free, which may be suitable for lactose-intolerant individuals

• Some hydrolysed proteins (like rice, pea, or marine collagen) are dairy-free

• Always read labels carefully and check allergen statements if you’re avoiding dairy

Understanding these differences can help you make the best protein choice for your dietary needs—whether you’re lactose intolerant, dairy allergic, or simply prefer plant-based options.

1. National Health and Medical Research Council – Australian Dietary Guidelines

2. Food Standards Australia New Zealand (FSANZ) – Food Allergen Labelling Guide

3. Journal of Dairy Science – Review on Hydrolysed Milk Proteins and Allergenicity

4. Nutrients Journal – Plant-Based Protein Trends and Digestibility

5. Dietitians Australia – Position Statement on Food Allergies and Protein Supplements